Malicious PDF — malware analysis report

Static analysis result for SHA-256 5482c7b31216462c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 23:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2006d0ac580d4cd3b0302584d3472156 SHA-1: dd333b7c8009d42efbf9cbbd547c4c5082f3decf SHA-256: 5482c7b31216462c76067f994aa35c3f6646d824ee5ef5d95a742fdf4a9af9a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/829aeaefa3d7244ca120ced82c835c6a/laluremivu.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021081006312673499.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/auufq7psfr9h3opqskd96grng3/29251079404.pdf
    • https://vinacomvietnam.vn/uploads/news_file/45150095325.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9dd9b2a7db94ca0b10a0b8e7a25b1b08/37107466517.pdf
    • http://nujhimachal.in/img/uploads/files/74020778828.pdf
    • http://aliceinformaticasrl.com/user/pages/deminajamod.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaa5488850---tozofelugagokutosafutod.pdf
    • https://alexandrapanayotou.com/web/images/static/file/fixefawevijademuke.pdf
    • http://apluskleaning.com/admin/images/file/86208933960.pdf
    • https://sealand-pptc.com/userfiles/file/59038969385.pdf
    • http://engroupe.ca/aym_image/files/46042830257.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fe0896f04b5bd2e9279bcaded8e77a96/24475849914.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610826123ffc6---ravuzuruzoge.pdf
    • https://garnet-medical.com/userfiles/files/79336594035.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0a7e0b9e---5766225390.pdf
    • http://constantemail.com/userfiles/file/162583814295678425807.pdf
    • http://3qbuy.com/CKEdit/upload/files/49853741712.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4eb5b71b30c8554a44c8cec5d5caa199/foxuzinasaw.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/97371732981.pdf
    • https://sunarchegypt.com/userfiles/file/98169012906.pdf
    • https://klcconsulting.eu/klc/file/foxabu.pdf
    • http://hitecds.com/userfiles/file/pidofiwonosozavigag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lietuvos+gydytojo+zurnalas+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 16792 bytes
font_01_sfnt_off0000e522.bin
175933da6cac0e8bccaa4419b686b1484fc617ebc9ea2c5d964a5c4138fcd9ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 18412 bytes
font_02_sfnt_off00011282.bin
67c7f5a5049f6a3e8f0c7ce2c82f7e1b2ea4d78f92b3e42d5fbd123e4d692bba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 11100 bytes